It was used it MTGs early years to play 3- and 4-MV cards ahead of time, but now the main application is in storm engines to generate enough mana to play a card like Ad Nauseam or Dark Petition
And in Planechase, it brings that reality to life
These are scattered across different formats but you can see how dynamic the mechanic is
Equip only as a sorcery.) Artifact - Equipment Ramp (CTRL to add secondary) Recursion Daretti, Scrap Savant +2: Discard up to two cards, then draw that many cards
Now, if the ink price is right, you can move your warriors to a variety of recognizable spots from the Disney stable, like Skull Rock or Treasure Planet's RLS Legacy
While I think that seven mana is expensive to get something that does nothing on its own, you can always cast Fractured Realm first and then cast Mirror Room in order to make two Reflections for the price of one